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Finding the Fourth Proportional to 1,308.10, 1,960.55 and 576.90

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Solution

The fourth proportional to 1,308.10, 1,960.55 and 576.90 is: 864.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.10 : 1,960.55 = 576.90 : x
  2. Step 2: Convert to fraction form
    1,308.10/1,960.55 = 576.90/x
  3. Step 3: Cross multiply
    1,308.10x = 1,960.55 × 576.90
  4. Step 4: Simplify right side
    1,308.10x = 1,131,041.30
  5. Step 5: Solve for x
    x = 1,131,041.30/1,308.10
  6. Step 6: Final answer
    x = 864.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.